During the 1960s, professional divers found during decompression in hyperbaric c...

During the 1960s, professional divers found during decompression in hyperbaric chambers that their watch’s crystal could pop out like a champagne cork. Indeed, these chambers are filled with breathing mixes containing helium, and this light gas seeps into the watch case but cannot escape fast enough from it. Thus excess of pressure trapped inside can force the crystal out. To avoid this hazard, #Rolex patented the helium escape valve in 1967, which frees the pressure without compromising the waterproofness of the Sea-Dweller.

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